- All sections
- C - Chemistrymetallurgy
- C21D - Modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or non-ferrous metals or alloysmaking metal malleable, e.g. by decarburisation or tempering
- C21D 9/22 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for drillsHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for milling cuttersHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for machine cutting tools
Patent holdings for IPC class C21D 9/22
Total number of patents in this class: 62
10-year publication summary
12
|
6
|
10
|
1
|
4
|
7
|
4
|
3
|
0
|
2
|
2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Hitachi Metals, Ltd. | 1982 |
5 |
Sandvik Mining and Construction Tools AB | 174 |
5 |
Baker Hughes Holdings LLC | 3007 |
4 |
AB Sandvik Coromant | 239 |
3 |
Ehwa Diamond Industrial Co., Ltd. | 62 |
3 |
Walzengießerei Coswig GmbH | 6 |
3 |
Black & Decker, Inc. | 2409 |
2 |
ArcelorMittal | 2285 |
2 |
Dayton Progress Corporation | 32 |
2 |
Furukawa Rock Drill Co., Ltd. | 36 |
2 |
Gühring KG | 356 |
2 |
Uddeholms Aktiebolag | 195 |
2 |
Epiroc Drilling Tools Aktiebolag | 82 |
2 |
Baker Hughes Incorporated | 5247 |
1 |
Halliburton Energy Services, Inc. | 20891 |
1 |
Airbus Deutschland GmbH | 220 |
1 |
Smith International, Inc. | 717 |
1 |
Kennametal Inc. | 1386 |
1 |
B & J Rocket Sales AG | 34 |
1 |
Baoshan Iron & Steel Co., Ltd. | 964 |
1 |
Other owners | 18 |